I keep finding myself needing to be able to run Unix commands within Processing sketches (maybe too much time spent writing Bash scripts lately), but no one seems to have a good solution. Today I was able to get the Java exec() command to work within Processing… hooray!
EDIT: want to do something more complex? You can run a Bash script too!
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/* * RUN UNIX COMMANDS IN PROCESSING * Jeff Thompson * Adapted and annotated from code by Wharfie * http://www.computing.net/answers/unix/run-unix-command-thr-java-program-/5887.html * July 2011 * * Runs Unix commands from within Processing. This can be *super* helpful for * doing complex operations on folders such as copying or compressing multiple * files. A simple command can make quick work of what would otherwise be a * cumbersome task in Processing and will likely be much quicker than any Java * implementation of the same process. * * You will likely need to specify the full path where you want to work, unless your * location is relative to your sketch. For example: /Users/jeffthompson/Desktop * * Suggestions to try: * whoami prints username currently logged on * ls this lists all files in the particular location * wc -w filename.extension this counts words in a particular file * cp sourcefile.ext destfile.txt makes a copy of a file to a new one * ./yourBashScript.sh run a Bash script * * For more ideas, look at the excellent SS64 site: http://ss64.com/bash * * www.jeffreythompson.org */ void setup() { // what command to run String commandToRun = "whoami"; // String commandToRun = "ls"; // String commandToRun = "wc -w sourcefile.extension"; // String commandToRun = "cp sourcefile.extension destinationfile.extension"; // String commandToRun = "./yourBashScript.sh" File workingDir = new File(sketchPath("")); // where to do it - should be full path String returnedValues; // value to return any results // give us some info: println("Running command: " + commandToRun); println("Location: " + workingDir); println("---------------------------------------------\n"); // run the command! try { // complicated! basically, we have to load the exec command within Java's Runtime // exec asks for 1. command to run, 2. null which essentially tells Processing to // inherit the environment settings from the current setup (I am a bit confused on // this so it seems best to leave it), and 3. location to work (full path is best) Process p = Runtime.getRuntime().exec(commandToRun, null, workingDir); // variable to check if we've received confirmation of the command int i = p.waitFor(); // if we have an output, print to screen if (i == 0) { // BufferedReader used to get values back from the command BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream())); // read the output from the command while ( (returnedValues = stdInput.readLine ()) != null) { println(returnedValues); } } // if there are any error messages but we can still get an output, they print here else { BufferedReader stdErr = new BufferedReader(new InputStreamReader(p.getErrorStream())); // if something is returned (ie: not null) print the result while ( (returnedValues = stdErr.readLine ()) != null) { println(returnedValues); } } } // if there is an error, let us know catch (Exception e) { println("Error running command!"); println(e); } // when done running command, quit println("\n---------------------------------------------"); println("DONE!"); exit(); } |